Set Office 365 Room Mailbox Calendar permissions and processing defaults, so subject and meeting organizer is visible.

Set Room Mailbox Calendar permissions and Processing defaults

#Connect to Office 365 Exchange (wont work if MFA is required.
#Use conditional access or whitelisting to allow the connection without MFA

$LiveCred = Get-Credential
$Session = New-PSSession -ConfigurationName Microsoft.Exchange-ConnectionUri https://ps.outlook.com/powershell/ -Credential $LiveCred -Authentication Basic -AllowRedirection
Import-PSSession $Session

#Get list fo All Room type mailboxes

$rooms = Get-MailBox | where {$_.ResourceType -eq "Room"}

#Set permissions and processing defaults on alle Room type mailboxes
foreach ($room in $rooms){

   $calName = $room | Get-MailboxFolderStatistics -FolderScope calendar | select-object Name
   write-host "Setting requested default permissions on: $($room.Identity):\$($calName.Name)" -ForegroundColor Yellow
   Set-MailboxFolderPermission -AccessRights LimitedDetails -Identity "$($room.Identity):\$($calName.Name)" -User default
   Set-CalendarProcessing -Identity "$($room.Identity)" -AddOrganizerToSubject $true -DeleteComments $false -DeleteSubject $false
   Write-Host "Done" -ForegroundColor Green
   Write-Host
	 
}